考虑多约束条件下的电-氢-化耦合系统控制方法

Control method of electric-hydrogen-chemistry coupling system considering multiple constraints

在电-氢-化耦合系统中,电解水制氢装置在消纳风、光等可再生能源或参与电网平衡调控的同时,其变负载运行需满足多约束条件,以保证系统各环节安全稳定运行。针对电-氢-化耦合系统中各环节存在的耦合作用关系,详细介绍了系统核心环节——电解水制氢系统的模型,并提出一种考虑各环节多约束条件下的系统控制方法。对兆瓦级碱性电解槽的模型进行详细分析,包括电化学模型、热力学模型等,同时建立辅助设备压缩机、储氢罐的数学模型;综合考虑电解槽温度、电解槽压力、储氢罐压力、下游煤化工环节用氢等约束条件,提出电解水制氢系统的控制策略。基于MATLAB/Simulink搭建电-氢-化耦合系统的仿真模型,并通过RT-LAB半实物仿真平台,在不同的电网功率指令下,对电-氢-化耦合系统的运行特性进行深入研究,并对所提控制策略的控制效果进行验证。

In the electric-hydrogen-chemistry coupling system,when the electrolytic water hydrogen production equipment consumes renewable energy,such as wind,photovoltaic,and so on,or participates in the balance regulation of the power grid,its variable load operation needs to meet multiple constraints to ensure the safe and stable operation of each link in the system.According to the coupling relationship of each link in the electric-hydrogen-chemistry coupling system,the model of electrolytic water hydrogen production system,which is the core link of the system,is introduced in detail.A system control method considering multiple constraints of each link is proposed.The model of megawatt alkaline electrolyzer is analy-zed in detail,including electrochemical model and thermodynamic model,and the mathematical models of auxiliary equipment,such as compressor and hydrogen storage tank,are established.The control strategy of the electrolytic water hydrogen production system is put forward considering the constraints of electrolyzer temperature,electrolyzer pressure,hydrogen storage tank pressure and hydrogen use in the downstream coal chemical industry link.The simulation model of the electric-hydrogen-chemistry coupling system is built based on MATLAB/Simulink,and the operation characteristics of the electric-hydrogen-chemistry coupling system are deeply studied by RT-LAB semi-physical simulation platform under different power instructions of the power grid,and the control effect of the proposed control strategy is verified.